Analysis of a time-lens based optical frame synchronizer and retimer for 10G Ethernet aiming at a Tb/s optical router/Switch design

Areal, Janaina Laguardia; Hu, Hao; Peucheret, Christophe; Palushani, Evarist; Puttini, Ricardo Staciarini; Clausen, A.T.; Berger, Michael; Osadchiy, Alexey V.; Oxenløwe, Leif Katsuo

doi:10.1109/ondm.2010.5431600

Cited by 5 publications

(4 citation statements)

References 8 publications

(10 reference statements)

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“…Typical jitter compensation and retiming designs 1,8,9 combine the time-lens with a dispersive element, usually a single mode fiber (SMF). Fig.1 shows the schematic setup for such a retiming unit.…”

Section: Designmentioning

confidence: 99%

“…In this paper, we are especially interested in pulse compression, optical synchronization and retiming of 10 Gbit/s Ethernet frames to a local clock corresponding to the base rate of an OTDM signal, without performing clock recovery on the input frame signal. We can briefly assess the requirements for such reception units, as follows: (1) Frames are asynchronously transmitted and received, so synchronization of the arriving frame to the local clock is needed.…”

Section: Introductionmentioning

confidence: 99%

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Time-lens based optical packet pulse compression and retiming

Areal

Palushani

et al. 2010

SPIE Proceedings

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This paper presents a new optical circuit that performs both pulse compression and frame synchronization and retiming. Our design aims at directly multiplexing several 10G Ethernet data packets (frames) to a high-speed OTDM link. This scheme is optically transparent and does not require clock recovery, resulting in a potentially very efficient solution. The scheme uses a time-lens, implemented through a sinusoidally driven optical phase modulation, combined with a linear dispersion element. As time-lenses are also used for pulse compression, we design the circuit also to perform pulse compression, as well. The overall design is: (1) Pulses are converted from NRZ to RZ; (2) pulses are synchronized, retimed and further compressed at the specially designed time-lens; and (3) with adequate optical delays, frames from different input interfaces are added, with a simple optical coupler, completing the OTDM signal generation. We demonstrate the effectiveness of the design by laboratory experiments.

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Section: Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Time-lens based optical packet pulse compression and retiming

Areal

Palushani

et al. 2010

SPIE Proceedings

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“…According to the protocol of 10 GE WAN PHY, the repetition rate of each Ethernet packet can vary with up to ± 20 ppm of the nominal transmission rate, i.e. ± 200 kHz frequency offset between transmitter and receiver must be tolerated [4,5].…”

Section: Introductionmentioning

confidence: 99%

Synchronization, retiming and time-division multiplexing of an asynchronous 10 Gigabit NRZ Ethernet packet to terabit Ethernet

Hu¹,

Areal²,

Mulvad³

et al. 2011

Opt. Express

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An asynchronous 10 Gb/s Ethernet packet with maximum packet size of 1518 bytes is synchronized and retimed to a master clock with 200 kHz frequency offset using a time lens. The NRZ packet is simultaneously converted into an RZ packet, then further pulse compressed to a FWHM of 400 fs and finally time-division multiplexed with a serial 1.28 Tb/s signal including a vacant time slot, thus forming a 1.29 Tb/s time-division multiplexed serial signal. Error-free performance of synchronizing, retiming, time-division multiplexing to a Terabit data stream and finally demultiplexing back to 10 Gb/s of the Ethernet packet is achieved.

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“…We have recently analyzed the design in Fig. 1(a) for various initial time misalignments and frequency offsets [3]. The time misalignment (Δt) between input pulses and the local clock changes by ΔT = 1/f -1/f L for each successive pulse, i.e.…”

Section: Introductionmentioning

confidence: 99%